Stop watch



i 4 Sheetsr-Sheet 1.- A. 0,. GUNN. STOP WATCH.

(No Model.)

No. 503,416. Patented Aug. 15, 1893.

4 Sheets-Sheet 2. I A. O. GUN N. STOP WATCH.

(No Model.)

Patented Aug. 15, 1893.

4 Sheets-Sheet 3. A. G. GUNN. STOP WATCH.

(No Model.)

Patented Aug. 15, 1893.

VIII/II No Model.) 4 Sheets-Sheet 4.

A. G. GUNN. STOP WATCH.)

No. 503,416. PdtentedAug. 15, 1893.

UNITED STATES PATENT OFFICE.

ALFRED CHARLES GUNN, OF GENEVA, SWITZERLAND.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No. 503,416, dated August 15, 1893.

Application filed January 25, 1893. Serial No. 469,636. (No model.)

To all whom it may concern:

Beit known that I, ALFRED CHARLES GUNN, of Geneva, Switzerland, have invented certain new and useful Improvements in Stop WVatches, of which the following is a specification.

The invention consists of a very compendious, strong and easily manufactured mechanism of watches indicating at a glance the time in hours, minutes and seconds, and indicating the measure of a lapse of time varying from one-fifth of a second to twenty-four hours.

In the accompanying drawings, Figure 1 is a face View of my improved stop watch. Fig. 2 is a plan view of the mechanism of my stop watch as seen after the removal of the dial, said mechanism being in a condition of rest. Fig. 3 is a similar plan view of the mechanism at the moment ofstarting. Fig. 4. is a similar plan view of the mechanism after the setting of the seconds and minutes hands to zero. Fig. 5 shows in a longitudinal section and elevation and an inverted plan the device causing the connection and disconnection of the seconds hand of the stop watch with the movement, and Fig. 5 is a longitudinal section of the same parts in larger size. Fig. 6 is an elevation of the connecting and disconnecting device of the hands of the minutes and hours indicator, and Fig. (i is a longitudinal section and partial elevation of the same parts in larger size. Fig. 7 is a diagram of the train of wheels. Fig. 8 is a section of the rocking piece E and wheels 6 and e In all the figures the same letters refer to the same parts.

As shown in Fig. 1 the watch indicates the time on two small dials A and B, the first one giving the hours and minutes and the second one giving the seconds as is usual in w." ches. A third dial 0 is intended to indicate the hours and minutes of the stop watch and the circumference of the watch dial bears the divisions of seconds and of one-fifth of seconds which are indicated thereon by the seconds hand D pivoted in the center of the watch.

The mechanism giving the usual time on the dials A and B is composed of the usual train of wheels which are substantially shown in Fig. 7 in which X is the spring barrel gear teeth, and Y is the pinion of the first wheel Y.

Z is an intermediate wheel and W is the seconds wheel placed in the center of the watch and whose pinion is acted upon by the wheel Z and the wheel N gears with theescapement wheel IV of any system whatever.

The hand setting mechanism which is shown in Figs. 2,3 and 4 is intended to act upon the hour wheel A, rotating as usual 011 the axis of the first wheel Y and bearing the hour hand on the dial A.

A is the usual transmitting wheel causing the minute wheel of said dial A to perform twelve revolutions while the hour hand performs one revolution. The hand setting mechanism is composed of a rocking bridge E pivoted at e and carrying the gear wheels 6 e and e which are constantly in gear with one another. The wheel 8' is constantly in gear with the crown pinion 6 The wheel 6 has an axis traversing the rocking bridge E and bearing on the top of the latter another wheel a fixed to said tubular axis by means of a screw e". The wheel a is generally in gear with the winding up pinion e by the action of the spring e upon the bridge E, but when the crown pinion is turned backward the teeth of the wheel 6 as it revolves slip upon the teeth of the wheel 6 and raise the rocking bridge E against the yielding action of the spring 6 which normally causes the wheel 6 to be in engagement with the wheel a. Apush leverF operates the rocking bridge E as shown in Fig. i so as to disengage the wheel a from the wheel a and at the same time to bring the wheel 6 into gear with the minute wheel A and the mechanism is then ready for setting the hands by revolving the stem.

The mainspring barrel X which gears as already stated with the pinion Y of the wheel Y gears at the same time with a pinion C fixed to an axis 0 on which is fixed with smooth friction a cannon pinion ll (Figs. 6 and 6) having a sleeve surrounding the axis 0. The said cannon pinion is provided with a spring h bearing with its two upturned arms against the lower face of a cannon disk J having a setting heart piece 3' and sleeve carrying the minutes hand 0 of the indicator. A second cannon wheel K also having a sleeve is placed above the diskJ and provided with a heart piece 7.: upon its under side looking toward the heart piece j so that both heart pieces 70 and j are adapted to be simultaneously acted upon by means of one and the same settinglever. The cannon of the wheel K carries the hour hand of the indicator.

An intermediate device composed of apinion gearing with the wheel K and a wheel L connected with said pinion and gearing with the pinion H connects the mechanism of the hands cc causingthem to move together, the wheel K moving its hand 0 from one division to another of the dial C while the pinion H moves its hand 0 a complete revolution. This intermediate device is pivoted to a rocking lever L which is acted upon by a suitable Spring so as to cause said device to engage with the wheel K and pinion II as just described but which may also be acted upon by the cam 0 so as to disengage said pinion and wheel L from said wheel K and pinion H when the cannon wheel K is to be stopped, the pinion H being constantly rotating and said pinion H being not liable to be stopped when the stop watch is arrested.

The stoppage of the hands 0 c of the dial 0 is effected by means of the projection m of the spring M bearing against the edge of the cannon disk J and preventing the rotation of the latter together with the wheel K and hands 0' 0 the spring h and pinion 11 being rotated by the axis C and the spring 7L slid ing against the under side of said disk J instead of operating to rotate the same. The spring M is thrown out of reach of the wheel J by means of the hammer N pivoted at a and bearing under the action of a spring a with its arm n against the cam O. Said arm a may be engaged more or less into the recesses of the cam Oas shown in Figs.2 and 4:. The extremity of the hammer N may be in the outcut m or against the face m of the spring M and according to these two positions the latter either bears with its projection m against the disk J, as seen in Fig. 3, or is held out of reach of said disk as shown in Figs. 2 and 4:. Then in the position Fig. 4, its projection n bears at a time upon the heart pieces 70 andj of the indicator, setting the two hands 0 0 simultaneously to zero. The hammer N furthermore effects the putting into or out of action of the seconds hand D as shown in Fig. 5. The axis Dplaeed in the center of the watch and performing one revolution each minute carries a disk P with rugous face, fixed to said axis, and a cannon disk Q provided with a rugous under face adjacent to the rugous face of the disk P. The cannon of the disk Q carries a heart piece qand the seconds hand D. Aspring R secured at r to theplate has aforked end receiving the can non of the disk Q and said spring normally tends to press the disk Q against the diskP (see Fig. thereby causing the disks P and Q to rotate together when the spring R is in anormalposition. This is the case when the hammer N which passes beneath said spring R is placed between the two projections r and r of the latter (see Figs. 1 and 5). If the hammerN is shifted and engaged beneath one or the other of said projections r 7' (Figs. 3, 4; and 5) the spring R is raised and this also raises the disk Q, heart piece (1 and hand D separating the disks P and Q from one another proparatory to stopping the hand I).

The stopping of the hand D is effected by means of the projection m of the spring M being brought to bear against the circumference of the disk Q simultaneous with the projection m of said spring M being brought to bear against the disk J as above speci lied, and this action takes place when the end of the hammer N is received in the recess m of the spring M as in Fig. 3. The setting to zero of the hand D is caused by the hammer N operating upon the heart cam q.

S is a spring brake acting upon the cam wheel 0, and T is the usual pushing lever pivoted at t and acted upon by a pusher, preferably by the winding stem as shown. Said lever T bears a pawl U acting upon the teeth of the ratchet cam wheel 0 as is usually the case in stop watches.

The herein described mechanism works as follows: Supposing the camO to be placed as shown in Fig. 2, it is to be seen that the arm n of the hammer N is partially engaged in one of the notches of the cam O and is placed in its middle position in which it allows the heart pieces j and 7a to rotate and raises the spring M out of reach of the disks Q and J. The rocking lever L acted upon by the spring Z engages its hook in a notch of the cam O and hereby causes the wheels of the device L to engage with the pinion H and wheel K. The hand D and the indicator hands 0 and c are therefore going. Now if the cam wheel 0 is rotated one tooth by the pawl U the hammer N is completely lifted and its extremity moves into the outcutm of the spring M; the points m and m of the spring M therefore strike both the disks J and Q and cause the hands D, c and c to be stopped. At the same time the rocking lever L is moved away by the cam 0 so as to disengage the device L from the pinion H and wheel K and the spring R is lifted by the action of the hammer N against the projection r (Fig. 5) whereby the disk Q is disengaged from the disk I. If the cam wheel 0 is again rotated one tooth by means of the push lever and pawl, the arm a is fully engaged in one of its notches. Thereby the spring M is lifted; the rocking lever L remains lifted or moved away and the spring R also, the hammer N striking the projection r as soon as it has left the projection 0* when passing from the position of Fig. 3 to that of Fig. 4; the disk Q can therefore be duly rotated to set the hand D to zero, when the hammer N strikes the heart piece q. At a new pressure of the pusher the hands D c and c are again started as described above with reference to Fig. 2.

I claim as my invention- 1. In a stop watch, the combination with the push levelypawl and cam wheel, of ahammer N, a spring R having downward projections r r on its under side adapted to be acted upon by the hammer N in its extreme movements, the arbor D and friction disk P upon said arbor, a sleeve around said arbor and the disk Q and the seconds hand D connected therewith, said spring R maintaining contact between the disks P and Q and the hammer N raising said spring to separate said disks, substantially as and for the purposes set forth.

2. In a stop watch, the combination with the push lever, pawl and cam wheel, the auxiliary dial and its hands 0 c and the independent seconds hand D, of the hammer or lever N, the spring M having projections m m and a concave portion M, the disks Q and J upon the arbors of said hands and having roughened edges adapted to be engaged and their rotation arrested by the aforesaid projections m m and the hands stopped when the end of the hammerN is moved into the concave portion m, substantially as and for the purposes set forth.

3. In a stop Watch, the combination with the auxiliary dial 0 and its hands 0' 0 the pusher, pawl and cam wheel,of the arbor O the pinions 0 and H on the arbor G, the spring h, the disk J and heart cam j and their tubular arbor carrying the minute hand 0', the toothed wheel K and heart cam 76 and their tubular arbor carrying the hand 0 means for st0p ping and releasing the disk J,.gears and means for moving the same into or out of contact with the pinion H and wheel K, substantially as and for the purposes set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED CHARLES GUN N.

Witnesses:

E. IMER SCHNEIDER, Orro MAY. 

